opencv error: undefined reference to `png_set_expand_gray_1_2_4_to_8@PNG16_0'

问题1：
/usr/bin/ld: warning: libpng16.so.16, needed by /home/andrei/anaconda/lib/libopencv_highgui.so, not found (try using -rpath or -rpath-link)
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_create_read_struct@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_interlace_handling@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_IHDR@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_get_io_ptr@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_longjmp_fn@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_gray_to_rgb@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_compression_level@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_bgr@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_filter@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_rgb_to_gray@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_init_io@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_destroy_read_struct@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_swap@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_get_IHDR@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_palette_to_rgb@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_compression_strategy@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_get_tRNS@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_write_info@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_packing@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_read_fn@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_create_info_struct@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_read_end@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_read_update_info@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_write_image@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_write_end@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_expand_gray_1_2_4_to_8@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_create_write_struct@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_read_image@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_read_info@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_strip_alpha@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_write_fn@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_destroy_write_struct@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_error@PNG16_0'
/home/andrei/anaconda/lib/libopencv_highgui.so: undefined reference to `png_set_strip_16@PNG16_0'
解决办法：
cd /usr/lib/x86_64-linux-gnu
sudo ln -s ~/anaconda/lib/libpng16.so.16 libpng16.so.16
sudo ldconfig
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作者：liugallup
来源：CSDN
原文：https://blog.csdn.net/liugallup/article/details/50326075
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